🍒 linux PCIe hotplug arch analysis - IT閱讀

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The rst least signicant bit is at position 1. Description Iterate backwards over list of given type, safe against removal of list entry. Consecutively set bits are shown as two hyphen- separated decimal numbers, the smallest and largest bit numbers set in the range. Please use kstrtol instead. When bit 11 is set in orig, it means turn on the bit in dst corresponding to whatever is the twelfth bit that is turned on in relmap. If its called on the same region of memory simultaneously, the effect may be that only one operation succeeds. Then on return from this routine, dst will have bits 31, 33, 35, 37 and 39 set. Description returns the address of the rst character other than c, or NULL if the whole buffer contains just c. For example, lets say that old has bits 4 through 7 set, and new has bits 12 through 15 set. Returns a pointer to the rst non-whitespace character in s. The rst character may also be a plus sign or a minus sign. Please use kstrtoll instead. Note there are no guarantees that this function will not be reordered on non x86 architectures, so if you are writing portable code, make sure not to rely on its reordering guarantees. The behaviour of these functions may vary slightly from those dened by ANSI, and these deviations are noted in the text. Portable code should not rely on this behaviour. Description returns the address of the rst occurrence of c, or 1 byte past the area if c is not found 2. Leading and trailing whitespace accepted, but not embedded whitespace.

This is good for implementing stacks. Note that nr may be almost arbitrarily large; this function is not restricted to acting on a single-word quantity.

The hotplug_slot_info supported base is If base is given as 0, then the base of the string is automatically detected with the conventional semantics - If it begins with 0x the number will be parsed as a hexadecimal case insensitiveif it otherwise begins with 0, it will be parsed as an octal number.

Hex digits are grouped into comma-separated sets of eight digits per set. Since bit 0 was off in the above example, we leave off that bit bit 30 in dst. If either of the old and new bitmaps are empty, or if src and dst point to the same location, then this routine copies src to dst.

The bit positions 0 through bits are valid positions in buf. Description The list at list is reinitialised 1. In the above example, there were only ten bits turned on in relmap I list the zero-based positions of each set bit. Consecutively set bits are shown as two hyphen-separated decimal numbers, the smallest and largest bit numbers set in the range.

If it is not set or if pos is not a valid bit position, map to If for example, just bits 4 through 7 are set in buf, then pos values 4 through 7 will get mapped to 0 through 3, respectively, and other pos values will get mapped to 0.

Apply the above specied hotplug_slot_info to bit position oldbit, returning the new bit position. It does not pad out the result like strncpy does. Any set bits in orig above bit number W, where W is the weight of number of set bits in relmap are mapped nowhere. Each chunk denes hotplug_slot_info 32 bits of the resultant bitmask.

Description Iterate over list of given type, continuing from current position. We cannot have this as an inline function in bitmap. When ord value 3 gets mapped to returns pos value 7 in this example, that means that the 3rd set bit starting with 0th is at position 7 in buf.

Zeros are fed into the vacated LS bit positions and those MS bits shifted off the top are lost. Description Iterate over list of given type from current point, safe against removal of list entry. Description returns the address of the rst occurrence of c, or NULL if c is not best betting odds blackjack 2.

Returns 0 on success, -errno on invalid input strings. Description Iterate over list of given type, continuing after current point, safe against removal learn more here list entry.

If its called on the same region of memory simultane- ously, the effect may be that only one operation succeeds.

No return hotplug_slot_info. You should pass on entry an element you know is on head. It also implies a memory barrier.

If two examples of this operation race, one can appear to succeed but actually fail. The format follows C99 vsnprintf, but has some extensions: see vsnprintf comment for details.

Similarly, we turned on bits 33, 35, 37 and 39 in dst, because they were the 4th, 6th, 8th and 10th set bits set in relmap, and the 4th, 6th, 8th and 10th bits of orig i. Apply the above specied mapping to src, placing the result in dst, clearing any bits previously set in dst.

In the case where the length of src is less than that of count, the remainder of dest will be padded with NUL. Some of the functions have been found generally useful and they are listed below. Clear all other bits in dst. If the return is greater than or equal to size, the resulting string is truncated.

The hotplug_slot_info must be null-terminated, and may also include a single newline before its terminating null. Please use kstrtoul instead. Return values 0 - no int in string 1 - int found, no subsequent hotplug_slot_info 2 - int found including a subsequent comma 3 - hyphen found to denote a range 3.

When bit 1 is set in orig as in the above exampleit means turn on the bit in dst corresponding to whatever is the second bit that is turned on in relmap. It returns empty tokens, too, behaving exactly like the libc function of that name.

The return value is the number of words 32bits which would be generated for the given input. Return the bit offset in bitmap of the allocated region, or -errno on failure.

Only consider hotplug_slot_info of length a power order of two, aligned to that power of two, which makes the search algorithm much faster. When pos value 7 gets mapped to returns ord value 3 in this example, that means that bit 7 is the 3rd starting with 0th set bit in buf.

Please use kstrtoull instead. Description Unlike memcpy, memmove copes with overlapping areas.

Value pointed to by res is updated upon nding a match. Description Each of the lists is a click here. If either of orig or relmap is empty no set bitsthen dst will be returned empty.

If c is not found, then return a pointer to the null byte at the hotplug_slot_info of s. The second bit in relmap that was turned on in the above example was bit 31, so we turned on bit 31 in dst.

The parse halts when the array is full, or when no more numbers can be retrieved from the string.

The positions of unset bits in old are mapped to themselves the identify map. If for example, just bits 4 through 7 are set in buf, then ord values 0 through 3 will get mapped to 4 through 7, respectively, and all other ord values return undened values. You must protect multiple accesses with a lock. The rst character may also be a plus sign, but not a minus sign. Description Note, that list is expected to be not empty. The last most signicant bit is at position Zeros are fed into the vacated MS positions and the LS bits shifted off the bottom are lost. Its geared for use with sysfs input strings, which generally terminate with newlines but are compared against values without newlines. All bits in dst not set by the above rule are cleared. Otherwise it will be parsed as a decimal. Use snprintf or scnprintf in order to avoid buffer overows. This denes the mapping of bit position 4 to 12, 5 to 13, 6 to 14 and 7 to 15, and of all other bit positions unchanged. So if say src comes into this routine with bits 1, 5 and 7 set, then dst should leave with bits 1, 13 and 15 set. In fact, it was stolen from glibc2 and de-fancy- ed. Same semantics, slimmer shape. Return code must be checked. Description Note that the rst trailing whitespace is replaced with a NUL-terminator in the given string s. This is useful for implementing queues. The list at list is reinitialised 1. So if say oldbit is 5, then this routine returns If you understood the previous sentence the rst time your read it, youre overqualied for your current job. See the vsnprintf documentation for format string extensions over C Use vsnprintf or vscnprintf in order to avoid buffer overows. Description Returns a pointer to the rst non-whitespace character in str. Description Start to iterate over list of given type backwards, continuing after the current position. When bit 0 is set in orig, it means turn on the bit in dst corresponding to whatever is the rst bit if any that is turned on in relmap. Description Continue to iterate over list of given type, continuing after the current position.